CN111104733B - Marine pump operation environment simulation system and method - Google Patents
Marine pump operation environment simulation system and method Download PDFInfo
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Abstract
The invention provides a marine pump operation environment simulation system and method, and belongs to the field of fluid mechanical numerical calculation. The system mainly comprises a model acquisition module, a motion rule acquisition module and a model setting module; the motion rule acquisition module acquires a ship pump swing rule and a fluid medium impeller rotating shaft position change rule according to the three-dimensional model established by the model acquisition module; the model setting module conducts grid division on the motion rule and the three-dimensional model to obtain grid data, the grid data are led into the fluid analysis unit to be processed, and a complete marine pump operation environment is simulated and established; according to the simulation method, the periodic angular displacement motion law of the swing of the marine pump is loaded into the fluid medium in a function mode, so that the fluid medium and the marine pump keep consistent in motion, and the design rationality and the operation stability of the marine pump are improved; the dependence on the design method of the land-based pump in the design process of the ship-based pump can be reduced.
Description
Technical Field
The invention belongs to the field of fluid mechanical numerical calculation, and particularly relates to a marine pump operation environment simulation system and method.
Background
The marine pump is a machine on a ship for increasing the pressure or potential energy of liquid and liquid materials to flow, and is widely applied to various systems such as power, fire protection, ballast, drainage, water drainage, sanitation and the like of the ship. As the ship can swing and incline under the action of wind, sea wave and other factors, the marine pump and the medium in the pipeline can generate additional acceleration and additional inertia force, so that the working medium can periodically fluctuate, the unsteady flow characteristic and the dynamic response characteristic are affected, and meanwhile, the hydraulic performance of the marine pump can be reduced due to the stress change of the marine pump when the marine pump operates in a swinging environment, and vibration, noise and the like are aggravated.
At present, most domestic marine pumps in China adopt a design method based on half theory and half experience of land-based pump design, and it is difficult to completely meet the multi-objective design requirements of marine pump performance parameters, reliability, environmental conditions and the like. It is therefore necessary to accurately simulate the operating environment of the marine pump by research to determine the suitability of the marine pump for use in tilting and swaying environments. The method not only can greatly simplify the test complexity of the marine pump and reduce the test cost, but also can shorten the research period and improve the design technical level of the marine pump.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a marine pump operation environment simulation system and a marine pump operation environment simulation method, which load the periodic angular displacement motion law of the swing of the marine pump into the fluid medium impeller in a functional form, so that the fluid medium and the marine pump keep consistent in motion, and the design rationality and the operation stability of the marine pump can be improved.
The present invention achieves the above technical object by the following means.
The marine pump running environment simulation system comprises a model acquisition module, a motion rule acquisition module and a model setting module which are connected in sequence in a signal mode, wherein the model acquisition module and the model setting module are also connected in a signal mode;
The model acquisition module performs three-dimensional modeling and grid division on the fluid domain;
The motion law acquisition module acquires a ship pump swinging law and an impeller rotating shaft position change law;
The model setting module simulates the running environment of the ship pump and sets boundary conditions.
A marine pump operation environment simulation method comprises the following steps:
Step (1): performing three-dimensional modeling and grid division on a marine pump fluid domain;
step (2): acquiring a ship pump swinging rule and an impeller rotating shaft position change rule according to the three-dimensional model;
step (3): and (3) simulating the running environment of the ship pump by using the motion law obtained in the step (2) and the grid data obtained in the step (1), and setting boundary conditions.
Further, the three-dimensional model obtained by three-dimensional modeling in the step (1) is divided into four sections of fluid areas: the water body of the outlet section, the water body of the volute section, the water body of the impeller section and the water body of the inlet section.
Further, the meshing requirement in the step (1) is as follows: the quality of the grid is ensured to be more than 0.2, and the minimum grid angle is ensured to be more than 18 degrees.
Further, the swing rule of the ship pump in the step (2) is expressed as an angular displacement and angular velocity rule of the ship pump swing.
Further, the angular displacement and angular velocity of the marine pump roll are as follows:
wherein θz is the angular displacement of the wobble with the pump, in rad; θ m,z is the amplitude of the swing angle of the marine pump, and the unit is rad; f z is the frequency of the swing motion of the marine pump, and the unit is Hz; the unit is rad for the initial phase; t is time; and theta' z is the angular velocity of the marine pump swing in rad/s.
Further, the change rule of the impeller rotating shaft position in the step (2) is expressed as a periodic change rule in the form of a trigonometric function along with the swing angle displacement of the marine pump.
Further, the change rule of the position of the impeller rotating shaft is as follows:
PX＝rop×sin(θz)
Py＝rop×cos(θz)
Wherein P is any point on the rotation shaft of the impeller; o is the origin of the coordinate axis; p x is the X-axis coordinate of point P; p y is the Y-axis coordinate of point P; r op is a constant, representing the magnitude of vector OP; θz is the angular displacement in rad of the wobble with the pump.
Further, in the step (3), the swing motion frequency f z and the swing angle amplitude of the ship pump can be changedTo simulate the inflow and structural deformation of the marine pump at different swing frequencies and amplitudes.
The invention has the following beneficial effects:
Compared with the prior art, the invention provides the system and the numerical calculation method which can simulate the real running environment of the ship pump, and are used for acquiring the internal and external characteristics of the ship pump during the swinging motion, so that the dependence on the design method of the land pump in the design process of the ship pump is reduced; the self-defined function is corrected through the swing performance test of the marine pump, so that the internal flow and the structural deformation of the marine pump under different swing frequencies and amplitudes can be accurately simulated, and the reliability design of the marine pump is ensured; the periodic angular displacement motion law of the ship pump swing is loaded into the fluid medium in a function mode, so that the fluid medium impeller and the ship pump keep consistent in motion, a basis is provided for the structural reliability design of the ship pump, and the design rationality and the operation stability of the ship pump are improved.
Drawings
FIG. 1 is a schematic diagram of a marine pump operating environment simulation system according to the present invention;
FIG. 2 is a schematic view of a three-dimensional model of the fluid domain of the marine pump according to the present invention;
FIG. 3 is a schematic diagram of the swing law of the marine pump according to the present invention;
Fig. 4 is a schematic diagram of the change rule of the impeller position according to the present invention.
In the figure: 1-outlet section water body; 2-volute section water body; 3-impeller section water; 4-importation section water body; 5-pumping a fluid domain water body for a ship; 6-impeller.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
The marine pump adopted in the embodiment is a single-stage single-suction centrifugal pump for a ship, and the impeller is closed; the main design parameters are as follows: the flow is 25m3/h, the lift is 34m, the rotating speed is 2950r/min, and the specific rotating speed is 66.7; the conveying medium is seawater, the diameter of an impeller inlet is 65mm, the diameter of an impeller outlet is 165mm, the number of blades is 6, the width of the impeller outlet is 7mm, the diameter of a volute base circle is 165mm, and the width of the volute inlet is 20mm.
As shown in FIG. 1, the marine pump operation environment simulation system comprises a model acquisition module, a motion rule acquisition module and a model setting module. The model acquisition module comprises a three-dimensional modeling unit, a grid dividing unit and a grid quality inspection unit and is mainly used for carrying out three-dimensional modeling and grid division on the fluid domain of the marine pump; the motion law acquisition module is in signal connection with the model acquisition module, and determines the swing law of the ship pump and the position change law of the impeller rotating shaft according to the three-dimensional model obtained by the model acquisition module; the model setting module is respectively connected with the motion rule acquisition module and the model acquisition module through signals and comprises a self-defining function unit, a fluid analysis unit, a calculation model selection unit, a material attribute module unit, a grid motion unit and a boundary condition setting unit, and is used for acquiring motion rule data and grid data, setting model boundary conditions and simulating a complete marine pump operation environment.
The marine pump operation environment simulation method specifically comprises the following steps:
Step one: inputting design parameters of the single-stage single-suction centrifugal pump for the ship, which is adopted in the embodiment, into a three-dimensional modeling unit, performing three-dimensional modeling setting on a fluid domain of the ship pump, and establishing a three-dimensional model shown in figure 2; different fluid areas are divided according to the structures of all parts of the model to form model data, and four sections of fluid areas are divided in the embodiment: an outlet section water body 1, a volute section water body 2, an impeller section water body 3 and an inlet section water body 4; the method comprises the steps of importing an integral three-dimensional model obtained through three-dimensional modeling into a grid dividing unit, and dividing grids of the model; and checking the divided grid quality in a grid quality checking unit, ensuring that the grid quality is greater than 0.2, ensuring that the minimum grid angle is greater than 18 degrees, and re-dividing the three-dimensional model until the two conditions are met if the two conditions are not met, so as to ensure the accuracy and finally forming the grid data.
Step two: this step is performed in a motion law acquisition module, as shown in fig. 3, a three-dimensional rotation coordinate axis of the ship pump is established according to a three-dimensional model, the origin of the coordinate axis is an O point, and the rotation is a Z axis; the angular displacement and the angular speed of the swing of the ship pump can be obtained by defining the frequency of the swing motion and the amplitude of the swing angle of the ship pump, namely the swing rule of the ship pump, and the specific process is as follows: setting the frequency of the swing motion of the marine pump as f z, and the unit is Hz; the amplitude of the swing angle of the marine pump is theta m,z and the unit rad;
The angular displacement of the swing of the ship pump is θz, and the unit rad; the angular speed of the swing of the marine pump is theta' z, and the unit rad/s; initial phase is A unit rad; the time is t; wherein θz noteq 0, θz noteq 0.
The formula (1) shows the displacement change rule when the ship pump performs swinging motion; the formula (2) shows the speed change rule when the ship pump performs swinging motion.
As shown in fig. 3 and 4, the impeller 6 is located at the central part of the water body 5 of the fluid domain of the marine pump, in order to make the fluid medium impeller and the marine pump consistent in motion, it is set that when the marine pump rotates and swings around the Z axis, the impeller 6 rotates on the XOY plane, the origin of the coordinate axis of the rotating coordinate axis of the impeller 6 is also the O point, and the rotating axis of the impeller 6 is the Y axis; selecting any point P on the Y axis, and obtaining the track of the point P swinging along with the ship pump according to the swinging rule of the ship pump, wherein the specific process is as follows:
when the initial state is set, the selected point P coordinate is (0, r op,0),rop is a constant and represents the magnitude of a vector OP, when the ship pump swings, the point P correspondingly moves, the rotation axis position of the impeller 6 is the vector OP coordinate (P x,Py, 0), wherein P x represents the X-axis coordinate of the point P, P y represents the Y-axis coordinate of the point P, and the rotation axis position of the impeller 6 shows a periodical change rule in a form of a trigonometric function along with the swing angle displacement θz of the ship pump because the impeller and the ship pump are consistent in movement:
PX＝rop×sin(θz) (4)
Py＝rop×cos(θz) (5)
Step three: the model setting module acquires the swing rule data of the ship pump and the change rule data of the rotation shaft position of the impeller 6 from the motion rule acquisition module, and introduces the swing rule data and the change rule data into the custom function unit, and in the custom function unit, motion rule source data of each part of fluid area are formed according to the introduced motion rule data; the source data and the grid data in the first step are jointly led into a fluid analysis unit to simulate the running environment of the ship pump; the internal flow and the structural deformation of the marine pump under different swing frequencies and amplitudes can be accurately simulated by changing the swing motion frequency and swing angle amplitude of the marine pump in the source data, so that the influence of the different swing frequencies and swing angle amplitudes on the marine pump is studied, and the continuous correction of the custom function unit is realized. In order to make the simulated operation environment more perfect, boundary condition setting is needed, which specifically comprises the following steps: (1) Selecting a k-Epsilon turbulence model in a calculation model selection unit; selecting a fluid medium as liquid-water in the material property module unit, wherein the density of the fluid medium is 998kg/m3; (2) Region properties of different regions are set at the region condition unit: setting the whole fluid domain as a swing domain, and rotating the impeller water body relative to the whole fluid domain; (3) Leading in the swing rule data of the ship pump in the grid motion unit of the corresponding area, and setting the absolute motion of the ship pump and the relative motion between the impeller and the ship pump; (4) Setting an inlet-outlet boundary condition in a boundary condition setting unit: the flow inlet is set to be 6.67kg/s, and the flow outlet is set to be free outflow; (5) The boundary condition setting means sets all the calculation domain walls as slip-free walls, and uses a rotation coordinate system.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
Claims (7)
1. The marine pump operation environment simulation method is characterized by comprising the following steps of:
Step (1): performing three-dimensional modeling and grid division on a marine pump fluid domain;
Step (2): acquiring a ship pump swinging rule and a rotation shaft position change rule of the impeller (6) according to the three-dimensional model;
The ship pump swinging rule is expressed as angular displacement and angular speed rule of the ship pump swinging;
The angular displacement and angular velocity of the swing of the marine pump are as follows:
wherein θz is the angular displacement of the wobble with the pump, in rad; θ m,z is the amplitude of the swing angle of the marine pump, and the unit is rad; f z is the frequency of the swing motion of the marine pump, and the unit is Hz; The unit is rad for the initial phase; t is time; θ' z is the angular velocity of the marine pump swing in rad/s;
step (3): and (3) simulating the running environment of the ship pump by using the motion law obtained in the step (2) and the grid data obtained in the step (1), and setting boundary conditions.
2. The method according to claim 1, wherein the three-dimensional model obtained by three-dimensional modeling in the step (1) is divided into four fluid areas: the water treatment device comprises an outlet section water body (1), a volute section water body (2), an impeller section water body (3) and an inlet section water body (4).
3. The method for simulating the operation environment of a marine pump according to claim 1, wherein the meshing requirements in the step (1) are as follows: the quality of the grid is ensured to be more than 0.2, and the minimum grid angle is ensured to be more than 18 degrees.
4. The method according to claim 1, wherein the variation law of the rotation axis position of the impeller (6) in the step (2) is expressed as a periodic variation law in the form of a trigonometric function with the angular displacement of the marine pump.
5. The method for simulating the operation environment of the marine pump according to claim 4, wherein the change rule of the rotation axis position of the impeller (6) is as follows:
PX＝rop×sin(θz)
Py＝rop×cos(θz)
Wherein P is any point on the rotating shaft of the impeller (6); o is the origin of the coordinate axis; p x is the X-axis coordinate of point P; p y is the Y-axis coordinate of point P; r op is a constant, representing the magnitude of vector OP; θz is the angular displacement in rad of the wobble with the pump.
6. The method according to claim 1, wherein in the step (3), the swing frequency f z and the swing angle amplitude of the ship pump are changedTo simulate the inflow and structural deformation of the marine pump at different swing frequencies and amplitudes.
7. A marine pump operating environment simulation system for implementing the marine pump operating environment simulation method according to any one of claims 1-6, characterized by comprising a model acquisition module, a motion law acquisition module and a model setting module which are connected in sequence by signals, wherein the model acquisition module and the model setting module are also connected by signals;
The model acquisition module performs three-dimensional modeling and grid division on the fluid domain;
the motion law acquisition module acquires a ship pump swinging law and a rotation shaft position change law of the impeller (6);
The model setting module simulates the running environment of the ship pump and sets boundary conditions.
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| CN107016203A (en) * | 2017-04-14 | 2017-08-04 | 江苏大学 | A kind of method for numerical simulation of photovoltaic water pump internal flow |
| CN107273570A (en) * | 2017-05-10 | 2017-10-20 | 江苏大学 | A kind of blade pump cavitation Inductive noise Numerical Prediction Method |
| CN109268200A (en) * | 2018-08-29 | 2019-01-25 | 哈尔滨工业大学 | It is a kind of for pump turbine fly ease transient process dynamic characteristic and inner flowing characteristic analysis method |
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| CN108593501A (en) * | 2018-04-28 | 2018-09-28 | 中国石油大学(华东) | A kind of contact angle of porous media determines method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107016203A (en) * | 2017-04-14 | 2017-08-04 | 江苏大学 | A kind of method for numerical simulation of photovoltaic water pump internal flow |
| CN107273570A (en) * | 2017-05-10 | 2017-10-20 | 江苏大学 | A kind of blade pump cavitation Inductive noise Numerical Prediction Method |
| CN109268200A (en) * | 2018-08-29 | 2019-01-25 | 哈尔滨工业大学 | It is a kind of for pump turbine fly ease transient process dynamic characteristic and inner flowing characteristic analysis method |
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